Tính giá trị biểu thức:
1 x 2 x 3 x 4 x 5 x 6 + 2 x 4 + 3 x 3 + 5 x 6 x 7 x 8 - 3 x 4 x 5 x 6 - 2 x 4 x 5
Tính: a) 3 x 4 x 7 / 5 x 3 x 4 b) 2 x 5 x 6 x 8 / 6 x 2 x 8 x 9 c) 4 x 5 x 6 / 3 x 10 x 8
Tìm x
x - 4/5 = 3/7
x + 3/7 = 4/5
19/20 - x = 8/5 - 3/4
4/5 x X = 6/9 - 4/7
x : 7/9 = 6/8
2/3 - x/6 = 6/18
Tìm x
x - 4/5 = 3/7
x + 3/7 = 4/5
19/20 - x = 8/5 - 3/4
4/5 x X = 6/9 - 4/7
x : 7/9 = 6/8
2/3 - x/6 = 6/18
Tính :
a) 4 x 6 x 8 / 6 x 12 x 16
b) 3 x 4 x 5 x 6 / 9 x 8 x 10 x 3
Tính :
a) 4 x 6 x 8 / 6 x 12 x 16
b) 3 x 4 x 5 x 6 / 9 x 8 x 10 x 3
a) X x 6 x 7.......7 x X x 6
b) X x 5 x 8....X x 5 x 7
c) 2 x X x 3......X x 3
tính bằng cách thuận tiện nhất :
1/2 x 2/3 x 3/4 x 4/5 x 5/6
1/10 x 2/9 x 3/8 x 4/7 x 5/6 x 6/5 x 7/4 x 3/8 x 9/2
a) 8 x 427 x 3 + 6 x 573 x 4
b) 6 x 1235 x 20 – 5 x 235 x 24
c) (72 x 135 + 9 x 65 + 8) : 25 – 3500 : 25
d) (18 x 957 – 9 x 354 x 2 – 3 x 621 x 6) : 72